Here's why it's more complex than just a single fuse:
* Ignition Switch: The ignition switch itself is a critical component. A faulty switch won't send power to the coil, regardless of fuse status.
* Multiple Circuits: The ignition system usually draws power through several circuits that may have their own fuses. These could include the ignition switch circuit, the starter circuit (which often has a hefty wire running to it), and possibly a fuse related to the voltage regulator. A bad fuse in any of these related circuits will affect ignition.
* Wiring Issues: Broken or corroded wiring is a common culprit. A seemingly good fuse could still be ineffective if there's a break in the wire leading to or from it.
* Coil itself: The ignition coil can fail internally.
Troubleshooting Steps:
1. Check the obvious: Start by checking the fuses related to the ignition system in your Impala's fuse box. Your owner's manual should show a fuse diagram. Look for fuses related to the ignition switch, starter, and any circuits related to the distributor.
2. Test the Ignition Switch: A qualified mechanic can easily test your ignition switch to confirm it's sending power when the key is turned.
3. Test for power at the coil: Using a multimeter, check for power at the positive (+) and negative (-) terminals of the coil itself. You'll need to know which wire goes to which terminal. This requires knowledge of your car's electrical system.
4. Check the wiring: Visually inspect all wiring leading to and from the ignition coil, ignition switch, and related components for any obvious breaks, corrosion, or loose connections.
5. Professional Help: If you're not comfortable with automotive electrical systems, take your car to a mechanic. They have the tools and expertise to diagnose the problem accurately and efficiently.
Don't assume it's just a single blown fuse. The ignition system in a classic car like a '68 Impala is more complex than modern vehicles, so a methodical approach to troubleshooting is necessary.
